Ostrau Wastewater Treatment Plant, Saxony, Germany

The Ostrau wastewater treatment plant is located in the town of Ostrau, within the Mittelsachsen district of Saxony, Germany. It served a small population of approximately 1,800 residents before its operational status was listed as closed. The plant was designed with a capacity of 2,400 m³ per day and had a reported discharge volume of 455.54 m³ per day. As a German facility, Ostrau operated under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations under 2,000 population equivalent in freshwater areas. However, this plant employed advanced treatment, exceeding the minimum requirements. The plant's closure may reflect consolidation of wastewater services in the region. The plant's discharge ultimately flows into the Elbe River basin, which drains into the North Sea. The Elbe is a major European waterway supporting diverse aquatic ecosystems and providing drinking water for millions. The advanced treatment level at Ostrau would have helped protect downstream water quality in this ecologically significant basin.

The Ostrau plant discharged into the Elbe River basin, which flows through Germany and the Czech Republic before reaching the North Sea. The Elbe supports a variety of fish species and serves as an important migratory corridor for birds. The advanced treatment level at the plant helped reduce nutrient loads, protecting downstream ecosystems from eutrophication.